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000 Series




Image Model+ Item Name Stock Price Quantity Discounts
ST004S Solid Teflon Backup Ring ST004S

ST004S Solid Teflon Backup Ring

AS568-004 (0.053" W X 0.096"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
6
$0.67

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Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST005S Solid Teflon Backup Ring ST005S

ST005S Solid Teflon Backup Ring

AS568-005 (0.053" W X 0.127"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
405
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST006S Solid Teflon Backup Ring ST006S

ST006S Solid Teflon Backup Ring

AS568-006 (0.053" W X 0.14"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
395
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST007S Solid Teflon Backup Ring ST007S

ST007S Solid Teflon Backup Ring

AS568-007 (0.053" W X 0.171"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
339
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST008S Solid Teflon Backup Ring ST008S

ST008S Solid Teflon Backup Ring

AS568-008 (0.053" W X 0.202"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
471
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST009S Solid Teflon Backup Ring ST009S

ST009S Solid Teflon Backup Ring

AS568-009 (0.053" W X 0.234"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
479
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST010S Solid Teflon Backup Ring ST010S

ST010S Solid Teflon Backup Ring

AS568-010 (0.053" W X 0.265"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
233
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST011S Solid Teflon Backup Ring ST011S

ST011S Solid Teflon Backup Ring

AS568-011 (0.053" W X 0.327"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
446
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST012S Solid Teflon Backup Ring ST012S

ST012S Solid Teflon Backup Ring

AS568-012 (0.053" W X 0.39"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
983
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST013S Solid Teflon Backup Ring ST013S

ST013S Solid Teflon Backup Ring

AS568-013 (0.053" W X 0.455"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
309
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST014S Solid Teflon Backup Ring ST014S

ST014S Solid Teflon Backup Ring

AS568-014 (0.053" W X 0.518"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
244
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST015S Solid Teflon Backup Ring ST015S

ST015S Solid Teflon Backup Ring

AS568-015 (0.053" W X 0.58"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
321
$0.67

Add:

Quantity Discounts
1-49$0.67
50-298$0.50
299+$0.34
ST016S Solid Teflon Backup Ring ST016S

ST016S Solid Teflon Backup Ring

AS568-016 (0.053" W X 0.643"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
359
$0.71

Add:

Quantity Discounts
1-46$0.71
47-281$0.53
282+$0.36
ST017S Solid Teflon Backup Ring ST017S

ST017S Solid Teflon Backup Ring

AS568-017 (0.053" W X 0.705"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
366
$0.74

Add:

Quantity Discounts
1-45$0.74
46-270$0.56
271+$0.37
ST018S Solid Teflon Backup Ring ST018S

ST018S Solid Teflon Backup Ring

AS568-018 (0.053" W X 0.768"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
429
$0.77

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Quantity Discounts
1-43$0.77
44-259$0.58
260+$0.39
ST019S Solid Teflon Backup Ring ST019S

ST019S Solid Teflon Backup Ring

AS568-019 (0.053" W X 0.83"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
16
$0.78

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Quantity Discounts
1-42$0.78
43-256$0.59
257+$0.39
ST020S Solid Teflon Backup Ring ST020S

ST020S Solid Teflon Backup Ring

AS568-020 (0.053" W X 0.893"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
11
$0.83

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Quantity Discounts
1-40$0.83
41-240$0.62
241+$0.42
ST021S Solid Teflon Backup Ring ST021S

ST021S Solid Teflon Backup Ring

AS568-021 (0.053" W X 0.955"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
1
$0.90

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Quantity Discounts
1-37$0.90
38-222$0.68
223+$0.45
ST022S Solid Teflon Backup Ring ST022S

ST022S Solid Teflon Backup Ring

AS568-022 (0.053" W X 1.018"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
0
$0.94

Add:

Quantity Discounts
1-35$0.94
36-212$0.71
213+$0.47
ST023S Solid Teflon Backup Ring ST023S

ST023S Solid Teflon Backup Ring

AS568-023 (0.053" W X 1.08"ID X 0.049"HT) Teflon PTFE Back-up Rings are designed to prevent extrusion in rubber O-ring sealing...
23
$1.04

Add:

Quantity Discounts
1-32$1.04
33-192$0.78
193+$0.52


What are the most common O-ring compounds?

We stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings